巷道断层破碎带预紧力锚杆支护合理参数选择  

Reasonable parameter selection of pre-tight anchor for roadway crossing fault fractured zone

作　　者：杨翎 YANG Ling(Anhui Jiangnan Blasting Engineering Company Limited,Xuancheng 242000,China)

机构地区：[1]安徽江南爆破工程有限公司,安徽宣城242000

出　　处：《建井技术》2024年第6期89-94,80,共7页Mine Construction Technology

基　　金：国家自然科学基金资助(51674005,51374009,50974001)。

摘　　要：预紧力锚杆可以在断层破碎带中形成较为均匀的预应力分布来提高断层破碎带的自承载力,合理选择预紧力锚杆支护参数,使断层破碎带自承载结构合理承载至关重要。结合具体工程实际,采用数值模拟方法建立断层破碎带预应力分析的数值计算模型,分析锚杆预紧力作用破碎带预应力大小、分布及叠加情况,以预应力较为均匀分布范围为断层破碎带的自承载结构厚度,以预应力大小来分析断层破碎带黏结力及内摩擦角的增量,并以此厚度及增量作为锚杆提高断层破碎带自承载力评价指标。分析锚杆预紧力、锚杆长度以及锚杆间排距等参数不同取值下预应力的大小及分布,进而选择合理锚杆参数使断层破碎带自承载结构合理承载。Pre-tight anchor can form a relatively uniform distribution of prestress in the fault fracture zone to improve the self-bearing capacity of the fault fracture zone.Reasonable selection of pre-tight anchor support parameters is crucial to ensure the reasonable load-bearing structure of the fault fracture zone.Combined with the actual engineering situation,a numerical calculation model for prestress analysis of fault fracture zone is established by using numerical simulation method to analyze the magnitude,distribution and superposition of prestress in the fracture zone under the action of pre-tight anchor.The self-bearing structure thickness of the fault fracture zone is taken as the relatively uniform distribution range of prestress,and the increment of the bond force and internal friction angle of the fault fracture zone is analyzed based on the magnitude of prestress.The thickness and increment are used as the evaluation index to improve the self-bearing capacity of fault fracture zone.The magnitude and distribution of prestress under different values of anchor bolt pre-tightening force,bolt length and anchor bolt row distance are analyzed,and then reasonable bolt parameters are selected to make the self-bearing structure of fault fracture zone bear reasonable load.

关 键 词：预紧力锚杆 断层破碎带自承载力 合理锚杆参数 预应力 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]